Hello all - We booked an Indigo non-stop flight that was departing around 4PM, landing 6PM.
However a schedule change has the flight leaving 9:30 PM and landing 11:30PM.

There are no other non-stops on that day (on any airline).
THere is a one stop 6E (leaving 1PM, landing 6PM).

Do I need to get with the 6E call center to change to the one-stop option?
Original non-stop flight was the highest fare class (allows changes, 999rupee cancel fee)

Will I have to likely pay "fare differences" or "change fees" to get the one-stop?

Any gotchas??